ICS9250BF-28

Overview

The ICS9250BF-28 is a frequency generator and buffer integrated circuit designed for Intel CPU server applications. Manufactured by Renesas Electronics Corporation, it operates with a crystal input to generate clock outputs up to a maximum frequency of 133.3MHz. The device features a 1:24 input-to-output ratio and does not support differential signaling. It functions within a supply voltage range of 3.135V to 3.465V and includes an internal Phase-Locked Loop (PLL). The component is housed in a 56-BSSOP package with a width of 7.50mm and is rated for operation between 0°C and 70°C.

Feature Summary

• Integrated PLL-based frequency generation for Intel CPU servers
• 1:24 input-to-output ratio with single circuit configuration
• Maximum output frequency of 133.3MHz using crystal input
• Operates on 3.135V ~ 3.465V supply voltage

Applications

• Intel CPU Server clock distribution
• System timing generation
• Frequency buffering for processor modules

Procurement Notes

Verify the specific suffix 'BF' against official Renesas documentation to confirm pinout and electrical characteristics, as suffixes often denote package or temperature variations. Confirm current availability status, as older server clock generators may be subject to end-of-life notices. Ensure the 56-SSOP footprint matches the target PCB design constraints.

Selection Notes

Select this component when designing for Intel CPU server architectures requiring a 1:24 clock fan-out from a crystal source. Ensure the system power rail provides a stable voltage between 3.135V and 3.465V. Verify that the 133.3MHz maximum frequency meets the bus speed requirements of the target processors. Consider the 56-SSOP package size for board space limitations.

Part Context

This part belongs to the ICS9250 series of clock generators optimized for Intel platform compliance. It serves as a critical timing element in server motherboards, distributing reference clocks to multiple CPU sockets or peripheral controllers. The series typically integrates low-jitter PLLs to maintain signal integrity across high-speed data paths.

Replacement Considerations

Check for direct replacements within the ICS9250 family or newer generations from Renesas. Verify pin compatibility and electrical parameters before substituting. Cross-reference with other manufacturers offering similar 56-SSOP clock generators if sourcing is restricted.